For structural alteration firms

Structural alteration firms: get found by homeowners planning a knock-through or steel beam, when our map opens in your area

Sign-up for structural alteration firms opens soon. Listing will be free while we build the map, with at least 30 days’ notice before any charge.

Many homeowners price the job on Estiquote before they ask for quotes. When our map opens in their area, they’ll search it for “a wall knocked through or a steel beam fitted” and see the structural alteration firms who cover it.

Homeowners see £3,000 to £5,400 for a 3 to 4 m knock-through with a steel beam before they ask you. Building work, mid-range finish, UK average outside London, including VAT, prices reviewed 25 September 2026. The cost guide.

Firm sign-up opens soon. Email support@estiquote.co.uk with your firm's name and trade, and we'll tell you the day it opens.

What homeowners see before they ask you

Structural alteration firms: jobs homeowners price, mid-range finish, including VAT
Job	Building work, UK average	Building work, London
Knock-through with steel beam: Up to 2 m	£1,800 to £3,000	£2,400 to £4,100
Knock-through with steel beam: 3 to 4 m	£3,000 to £5,400	£4,100 to £7,300
Knock-through with steel beam: Wider than 4 m or complex	£5,400 to £8,400	£7,300 to £11,300

A 3 to 4 m knock-through with a steel beam: building work by region, including VAT
Region	Building work
UK average (outside London)	£3,000 to £5,400
London	£4,100 to £7,300
South East	£3,500 to £6,200
East of England	£3,200 to £5,800
South West	£3,100 to £5,600
West Midlands	£2,900 to £5,200
East Midlands	£2,900 to £5,100
Scotland	£2,900 to £5,100
North West	£2,800 to £5,000
Yorkshire and the Humber	£2,800 to £5,000
Wales	£2,700 to £4,900
North East	£2,600 to £4,800
Northern Ireland	£2,500 to £4,400

Fees for a knock-through or steel beam in our cost guides, including VAT
Fee	Typical range, including VAT
Structural engineer, 25 m² extension	£870 to £2,300

What homeowners ask structural alteration firms

With what our guides tell them. Answer these in your quote, and later on your listing.

Who works out the size of the steel beam?

Homeowners are told to ask for the engineer’s calculations and the beam specification. Our knock-through prices include them, so say whether your price does. For an extension, our model puts a structural engineer at about £530 to £1,200 for 6 m² and £1,100 to £3,200 for 40 m² or more, including VAT.

Who deals with building control?

The application and the inspection are a line on our knock-through checklist. Building control fees vary widely between councils: see what each council charges.

Does the beam rest on a shared wall?

Then, in England and Wales, the neighbour must be given a party wall notice. One surveyor agreed by both sides costs about £1,100 to £1,800 for each neighbour, including VAT, if the neighbour doesn’t agree in writing.

What homeowners will ask you to confirm

From the checklist in our knock-through with steel beam guide:

Engineer: Calculations and beam specification.
Building control: Application and inspection.
Temporary works: Props and protection.
Party wall: Notices, if the beam rests on a shared wall.
Making good: Plaster, flooring and decoration.

What we’ll check before structural alteration firms appear

Companies House, if you’re a limited company or LLP: we’ll check the company is active.
Only if you take waste away: Waste carrier registration. The law and the registers
Who runs the business: an ID check, or a code letter for a company’s director.

Badges you can add (not needed to appear): TrustMark and Federation of Master Builders, and insurance.

Your listing will say, for example: Checked by Estiquote on 30 October 2026:

If you’re a limited company

Active company at Companies House

Limited company · VAT registered

If you’re a sole trader

Sole trader: business details checked by Estiquote

Sole trader · Not VAT registered

When sign-up opens for structural alteration firms, have ready your company number if you’re a limited company, your waste carrier registration number if you take waste away. Then you’ll create your account and send your profile for checks; we’ll usually reply within 5 working days.

Homeowners will choose up to 3 firms by name, and reviews will come only from real jobs, checked by a person: how quote requests and reviews will work.